Diamond-tool mold.



G. A. JOYCE.

DIAMOND TOOL MOLD.

APPLICATION FILED NOV. e, 1915.

1 174,073. Patented Mar. 7, 1916.

I ED STATES PATENT OFFICE.

GEORGE ALBERT JOYCE, OF LONDON, ENGLAND.

DIAMOND- POOL MOLD.

Specification of Letters Patent.

Patented Mar. '7, 1916.

Application filed November 6, 1915. Serial No. 59,937.

T aZZ whom, it may concern:

Be it known that I, GEORGE A. JoYoE, a subject of the King of England,and resi dent of London, England, have invented.

for setting diamonds or the like to be used ,stroying the skin and forindustrial purposes in metal mounts.

Heretofore it has usually been the practice to hold the diamond inposition during casting by a fusible element extending up through a slitor recess in the base of the mold, or in other ways to so support thediamond that its point protrudes from the casting in which it becomesembedded. The fusible element when utilized has been in the nature of animperforate metallic sheet. Serious objections are incident to suchpractice due to various causes. For instance, the contraction of themetal mount from the base of the mold, due to cooling, will frequentlyexpose an undue proportion of the stone and as a consequence the latterwill be held imperfectly in the mount. Also when an imperforate metallicsheet is uti lized for the fusible mount, the metal when poured firsthas to melt this sheet with the result that the metal may not actuallyreach the entire surface of the stone to be set. In this way air holeswill form in the mount and the stone will not besecurely held.

The object of this invention is to so mount the stone that it will besubstantially completely incased in the mount, care being also takenthat the-molten metal will reach every part of the surface of the stonein such a way that the skin or surface layer thereof is not destroyed. Q

In carrying out the above and other objects of the invention, I employsupporting means which hold the stone in spaced relation from the baseof the mold and for permitting metal to flow. to substantially entirelysurround the stone. vSuch supporting means here take the form of aholder extending above the imperforate base of the mold, together with afusible supporting element of imperforate character, such as wire mesh,between the holder and the stone, which permits the metal to make a hitand miss contact with the stone to reach all parts of the surfacethereof without deto entirely incase the stone.

In the accompanying drawings the invention is disclosed in-a concreteand preferred form.

In said drawings: Figure 1 is a vertical sectional view of a moldembodying the in 'vention. Fig. 2 is a vertical sectional view of themount showing the" stone embedded. -F1g. 3 is a sectional view showing amodified form of the invention.

element interposed between the stone and the holder.

In Fig. 1 the fusible supporting element 8 is wrapped around the stoneand its mid dle portion 9 formed into a tail which is inserted in theholder 4. In Fig. 3 theelement 8 is also wrapped around the stone andthe free ends 10 thereof are rolled up into coils or the like vwhichthen are inserted in the holder 4. When the metal is poured it not onlyfills the moldchamber, but also passes TlItO the holder 4- with theresult that the stone is substantially entirely incased in the metal. Inso doing, the fusible element is melted by the metal. Owing to theperforate or mesh character of this fusible element, the entire surfaceof the stone is reached by a hit and miss contact with the molten metal,and the stone becomes firmly embedded in the holder without destroyingits skin.

In Fig. 2 is shown the casting. Here the stone 7 is shown completelyembedded in the mount 11. The metal is then cut away to expose such partof the stone as may be desired, the cuts being substantially along thedotted lines 12.

What is claimed is:

1. An apparatus of the character set forth comprising: a mold, and ahollow supporting means for the stone to be set for holding said stonein spaced relation from the' base of the mold and for permitting metalto flow into the hollow supporting means the stone to be set above thebase of the mold, and a fusible perforate supporting element interposedbetween the holder and the stone for permitting metal to flow tosubstantially entirely surround the stone, the molten metal making a hitand miss contact with the stone.

Signed at London, England, this 18th day of October. A. D. 1915.

GEORGE ALBERT JOYCE.

\Vitness A. A. HAGGER.

